Update README.md

README.md

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 Find the code over [here](https://gitlab.com/feynman-integrals-nn/feynman-integrals-nn).
 
-We present this work in [arXiv](https://arxiv.org/abs/2312.02067).
+We present this work on [arXiv](https://arxiv.org/abs/2312.02067).